Dynamo-electric machine



March 16 1926-.

1,577,303 J. SCHURCH ammo ELECTRIC MACHINE Filed 00tl6,'l 1922 2 Sheets-Sheet 1 .jn z moz: d260,: 5010501.

A rwzmm March 16 1926.

2 Sheets-Sheet 2 .yn zyw'qzz Jkcoa jar/02cm v ATTORNEY-.51

ACOB "soHU noH .iori osanennns;onmroa vin, asslenonjononngnienr eq wa: I nyiznrsn; or jnosnnennneeamronnm, Am) ONE-HALF 'ro BENJAMIN ronrsongorfrrrrsiaunen;'r NNsY vnNIA. 1

' Beiit known that I, AOOB SCHURGH,QZI

icitizenofthe United' States, residing in Los Angeles,"=in the county-of Los Angeles, State ofCalifornia,havejinvented a new and use;

ful" Improveinent i in namo-Enema Mag 4 if chines, of whichthefollowingisa "specifica frinotors and generators-utilizingidirect cur-' rentx i {provide in a direct current dynamo-electric machine,a novel form o't field structure" A' further.- obj ect of theinVerition is taprovide in such a-machines a novel system of ventilation;

; 'l3lurtl1'ei:{objectsadvantages will be made evident hereinafter. e

'Referringto the 'drawlng' whichdis for fillus'trative purposes only Fig. 1 .is anelevation partly in section, taken substantially as 5 indicated by theline .A A of Fig. .2.

ziFig. 2 is an elevation partly in se'jctio n'in a plane represented by the line 22 of Fig. --1, portions of the windings being omitted i fortheiisake ofelearness The apparatus illustratedf may be con-, Qsi'der'ed either as 'aadirect-lcurrent motor or as 'j'aEj-direct current generator; In the fol- V lowing specification Ijwill describe the 111- V for"sparkless commutation.

vention asapplied to a generator. V In the operation of direct current dynamo- "electric machines, it is desirable to provide inthe field structure a" compensating windlng for taking care ofar'mature reaction, and

it is also desirable to "provide a commutating pole forthe purpose of'reversing the cur-' rent under the brushes, and thus providing In the generator-shown I tu-re which 'accomplishes both of these restructurei21 which consists offend-members :sults. In this structure I provide a housing 5'11, having end bells'12 and 13. Bearlng' brz'tcketsll l and 15 are secured in the end bells by means of bolts 16,- these bearing bracketscarrying bearings 17 V and 18, which support a'shaft 19.- The bearing structures 1.7rand. 1 8 are shown o'fball-bearing type,

but'may be'jof any convenient form, being lubricated "throughlubricating tubes 20.

'lxlountedf on the. shaft. 19 is an armature The lpriiicipalf'object of theinventionis to provide a strucr Q22 which are-pulled together by bolts 2 l'f,and which ar'e keyed and rigidlysecured on theish'aft 19; Secured between themembers 22 and .23yare'punchings 2 1 which are,

slotted to receive the armature coils 25. The

in the-directioniof the a r-rows."

'- The field: structure consists of punchings 30 mounted by'a ring'29 in the housing 11, these 'pu'nehings being optionally'made, from a ferruginoushmaterial carrying shunt field windingsf31,series' field windings 32, and

compensatingwindings Referring to Fig. 2, thepunchings' 3Q areprovidecl with compensating Windingislots35, 36, 37, P38,

and 39, and with shunt andseries field .win'ding slots 40 and 41. The slots 410 and 11 are separated by commutating poles 42. The

shunt and series coils 31 and 32 are, each placed in the slots 40 and 11, that is'to say, the coils 31 and 32 extend from a slot eiO'to a slot 41 as shownby dotted lines in Fig. 2. TlllS produces a field pole, having its-center on the line 11-'of Fig. 2, the strength of this pole depending upon the strength of current and the number of turns in the shunt and series coils 3l, and 32. The com-.

deeper than the other slots, and it is to be understood that a coil is to be placed in these slots, the center of these coils being along the line 00 of Fig. 2,this, line being 45 fromthe line 1'1 and passing through the center oft-he commutating pole 42.

Due to the fact that the slots 35, 3C, 37,

38, and 39, are progressively shallower, it should be noted that there remains beyond section of metal as the'plane 11' is approached. Inasmuch as themain flux is theend of these slots a constantly decreasing v symmetrical about the plane 11 it is evident that this construction" can be adopted without producing annndue concentration of flux at any point. On-to put it differently, itis evident thatthe cross-section of metal provided is adequate at all points for the flux, and this Willbennderstood if We consider the fact that the,- only flux passing thefiiixldelivered toth at tooth; Itis' thus possible withont undue concentration offlux to provideverydeep slots at 35' andfpro= gressively shallower slots at 36, 37; 38, and

'39, thus giving additional Winding space 7 It-Will also be seen that 'by pidiji ding the coninmtziting which is utilized forthe coils 33:

pole in'jthe. position:shown-{thispole sexcitd; byf all of the windings I 835 and the ain'ount-oftlux passing throughthis pole is directly proportional to the curre it pas si'iig through the ai'1natm e,-since tlieconipeiiszit- '1.-;In it directcurrentf machine, a "hold 1structurec0mp'r1s1ng: cal punch ng having slots arranged"ln p an s 011 mg .-coils are connected in series with the atmaturei 'fj 2,: V

claim as 'iny. uwention' dynamo-electric either side of'a radittlplaiie, each successive pair of ."slots' he'ingfd'eepep than'a the .ss lots nearer said plane; and compensating coils 7 arranged in zindfilling sziid slots.

{2. A field structure-as -claim 1 also comprisin commi tating pole sitnated on said plane and exc tedfby stud COllS;

punching having slots arrangedinpa-irs on i e thei s de of a 'ediel plsne,' each successwe; ,pa r jot slots "be ngdeeper than the Slots" 'n'iachine comprising :ga fe i'uginous ine nbc -.tield coils, each coil being situated inftw slots in said "ineinbel'f which are" sitiiateclflon eithcr' side of wi-adialgplane'; pandyn (50111: 7 pcnsating winding situated in slots in saidv I .1ne111'hei7,}.cacl1- of said slots being; deeper than the next .adj scent slot which sis 'fu 'ther,

v prising: com nntating polesf forniedfon said 3 In a Ydirect-current, dynamo-electric n a er sai pl ne and, compe sating" co arranged n and filling sald slotsfsaid field StI'UOt-HI'Q-j also comprisinge connnntziting pole sitn ited on saidplane ind excitedb'y saidgcoils, said field .1sti'uctureI'further conii prising fieldcoils, each of Whichis situated in 21 slot adjacent to. another conmiutating pole; L 11' 1.-

+l-. A iield structure t'ol a dylialno-clectr away fl on'i' 'saidj plane.

5; A- combination a's .in claim 'et, also com-'- members betweensaid vfield coils. V

Tn testimony whereoflllhziire hereunto set? my hand, at Philadelphizi, Pennsylvania, this 4th day of Oct. 1922'. v

JACOB Sc IUii H, 

